Remove unused OpportunisticResolve field

crates/compiler/can/src/constraint.rs

@@ -713,7 +713,6 @@ pub struct PatternEq(
 pub struct OpportunisticResolve {
     /// The specialized type of this lookup, to try to resolve.
     pub specialization_variable: Variable,
-    pub specialization_expectation: Index<Expected<Type>>,
 
     /// The ability member to try to resolve.
     pub member: Symbol,

crates/compiler/constrain/src/expr.rs

@@ -439,9 +439,6 @@ pub fn constrain_expr(
             if let Some(specialization_id) = specialization_id {
                 env.resolutions_to_make.push(OpportunisticResolve {
                     specialization_variable: specialization_var,
-                    specialization_expectation: constraints.push_expected_type(
-                        Expected::NoExpectation(Type::Variable(specialization_var)),
-                    ),
                     member: symbol,
                     specialization_id,
                 });

crates/compiler/solve/src/solve.rs

@@ -1530,8 +1530,6 @@ fn solve(
             }
             &Resolve(OpportunisticResolve {
                 specialization_variable,
-                // TODO: remove me
-                specialization_expectation: _,
                 member,
                 specialization_id,
             }) => {